CHICAGO (CBS)–  Officials confirmed there is a person in custody who is being questioned after entering the Naval Station Great Lakes without authorization.

That person is an employee and did have access the entire time. Friday’s graduation event at the station has been postponed until further notice.

The base is about 40 miles north of Chicago.

CBS 2’s Eric Cox has more.

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Officials took to Facebook to announce the lockdown and stated, “TAKE COVER IN NEAREST BUILDING OR STRUCTURE.”